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On the accuracy of a MJPEG-based digital image compression PIV-system

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Abstract

 In this communication, the Digital Image Compression (DIC) – PIV system is introduced. The present system allows the measurement of mean and RMS velocities in turbulent flow fields, using JPEG digital image compression technique for on-line recording of thousands of images. The decompression and subsequent analysis of the images, performed by means of digital cross-correlation technique, is carried out off-line. Errors incurred by the application of the compression method are assessed and discussed. The effect of the compression is firstly analysed by linearly traversing (synthetic) computer-generated PIV-images at constant velocity. Secondly, accurate LDA measurements and data from direct numerical simulation (DNS) are used as a basis for the analysis in a low Reynolds number open water channel flow. The results show that excellent agreement between LDA and DIC–PIV measurements for mean and RMS velocities can be achieved using a compression factor up to 12.

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Authors and Affiliations

  1. Volkswagen AG, Research and Development EZMM-1785, D-38436 Wolfsburg, Germany, , , , , , DE

    C. Freek & W. Hentschel

  2. Mechanical Engineering Department Instituto Superior Técnico, P-1096 Lisbon, Portugal, , , , , , PT

    J. M. M. Sousa

  3. Universität GH Essen, Lehrstuhl für Strömungslehre Postfach 10 37 64, D-45117 Essen, Germany, , , , , , DE

    W. Merzkirch

Authors
  1. C. Freek
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  2. J. M. M. Sousa
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  3. W. Hentschel
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  4. W. Merzkirch
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Received: 27 August 1996 / Accepted: 15 December 1998

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Freek, C., Sousa, J., Hentschel, W. et al. On the accuracy of a MJPEG-based digital image compression PIV-system. Experiments in Fluids 27, 310–320 (1999). https://doi.org/10.1007/s003480050355

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  • DOI: https://doi.org/10.1007/s003480050355

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